:root {
  --font-sans: 'Inter', 'Sarabun', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', 'Sarabun', 'Georgia', serif;

  /* Light theme values */
  --bg-color: #faf9f6;
  --text-color: #1a1917;
  --border-color: #e6e4df;
  --sidebar-bg: #f3f1eb;
  --sidebar-hover: #e7e5df;
  --header-bg: rgba(250, 249, 246, 0.85);
  --accent-color: #1a1917;
  --accent-rgb: 26, 25, 23;
  --text-muted: #706e6a;

  --font-size-base: 18px;
}

[data-theme="dark"] {
  /* Dark theme values (Minimalist black/charcoal) */
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --border-color: #242424;
  --sidebar-bg: #181818;
  --sidebar-hover: #262626;
  --header-bg: rgba(18, 18, 18, 0.85);
  --accent-color: #ffffff;
  --accent-rgb: 255, 255, 255;
  --text-muted: #8e8e8e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: 1.8;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.use-sans {
  font-family: var(--font-sans);
  line-height: 1.7;
}

/* Scroll Progress Bar */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-color);
  z-index: 1020;
  transition: width 0.1s ease;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
  z-index: 1000;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.header-right::-webkit-scrollbar {
  display: none;
}

/* Minimalist Buttons */
.btn {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background-color 0.2s ease, opacity 0.2s ease;
  outline: none;
  opacity: 0.8;
  flex-shrink: 0;
}

.btn:hover {
  background-color: var(--sidebar-hover);
  opacity: 1;
}

.btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chapter-title-header {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.88rem;
  max-width: min(560px, 50vw);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.85;
}

@media (max-width: 768px) {
  .chapter-title-header {
    max-width: 220px;
    font-size: 0.82rem;
  }
}

@media (max-width: 480px) {
  .chapter-title-header {
    max-width: 150px;
    font-size: 0.8rem;
  }
}

/* Sidebar Menu */
#sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: -330px;
  width: 330px;
  max-width: 85vw;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  z-index: 1010;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: flex;
  flex-direction: column;
}

#sidebar.open {
  transform: translateX(330px);
}

.sidebar-header {
  height: 56px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
}

.sidebar-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.9;
}

.sidebar-content {
  overflow-y: auto;
  flex-grow: 1;
  padding: 10px 0 20px;
}

.chapter-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-category {
  padding: 14px 16px 6px;
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-color);
  opacity: 0.65;
  border-top: 1px solid var(--border-color);
  margin-top: 10px;
  cursor: default;
  user-select: none;
}

.sidebar-category:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 6px;
}

.chapter-item {
  padding: 8px 16px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  transition: background-color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
  border-left: 3px solid transparent;
  opacity: 0.88;
  line-height: 1.4;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chapter-item:hover {
  background-color: var(--sidebar-hover);
  opacity: 1;
}

.chapter-item.active {
  border-left-color: var(--accent-color);
  background-color: var(--sidebar-hover);
  opacity: 1;
}

.chapter-item-badge {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent-color);
  opacity: 0.9;
  letter-spacing: 0.02em;
}

.chapter-item.active .chapter-item-badge {
  color: var(--accent-color);
  opacity: 1;
}

.chapter-item-name {
  font-size: 0.86rem;
  color: var(--text-color);
  opacity: 0.85;
  word-break: break-word;
}

.chapter-item.active .chapter-item-name {
  font-weight: 500;
  opacity: 1;
}

/* Overlay */
#overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.25);
  z-index: 1005;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

[data-theme="dark"] #overlay {
  background-color: rgba(0, 0, 0, 0.5);
}

#overlay.open {
  opacity: 1;
  visibility: visible;
}

/* Main Content Container */
.reader-container {
  max-width: 660px;
  margin: 92px auto 60px auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.reader-content {
  margin-bottom: 50px;
}

/* Markdown elements styling */
.reader-content p {
  margin-top: 0;
  margin-bottom: 1.5em;
  text-align: justify;
  text-justify: inter-character;
  word-break: normal;
  overflow-wrap: break-word;
}

body.align-left .reader-content p {
  text-align: left;
  text-justify: auto;
}

body.indent-enabled .reader-content p {
  text-indent: 2.5em;
}

.reader-content h1,
.reader-content h2,
.reader-content h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.8em;
  margin-bottom: 0.8em;
  color: var(--text-color);
}

.reader-content h1 {
  font-size: 1.6rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  margin-top: 0;
  margin-bottom: 1.5em;
}

.reader-content h2 {
  font-size: 1.3rem;
}

.reader-content h3 {
  font-size: 1.15rem;
}

.reader-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2.5em 0;
}

.reader-content blockquote {
  margin: 1.5em 0;
  padding-left: 16px;
  border-left: 2px solid var(--border-color);
  color: var(--text-muted);
  font-style: italic;
}

/* Bottom Navigation */
.nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding: 24px 0 48px 0;
  gap: 16px;
  margin-top: 40px;
}

.nav-link {
  font-family: var(--font-sans);
  text-decoration: none;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: 4px;
  font-size: 0.85rem;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  justify-content: center;
}

.nav-link:hover {
  background-color: var(--sidebar-hover);
}

.nav-link.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

.nav-link svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* CORS / File Protocol Alert */
.fallback-card {
  padding: 24px;
  border: 1px dashed var(--border-color);
  border-radius: 6px;
  font-family: var(--font-sans);
  text-align: center;
  background-color: var(--sidebar-bg);
}

.fallback-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 8px;
}

.fallback-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.code-instruction {
  background-color: var(--bg-color);
  padding: 8px 12px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.8rem;
  border: 1px solid var(--border-color);
  display: inline-block;
  margin-bottom: 8px;
}

/* Utility labels */
.theme-icon-light,
.theme-icon-dark {
  display: none;
}

[data-theme="light"] .theme-icon-dark {
  display: block;
}

[data-theme="dark"] .theme-icon-light {
  display: block;
}

/* Skeleton Loading */
.skeleton {
  animation: skeleton-loading 1.2s infinite ease-in-out;
  background-color: var(--sidebar-bg);
  border-radius: 4px;
  height: 1.2em;
  margin-bottom: 1em;
}

.skeleton.title {
  height: 2em;
  width: 60%;
  margin-bottom: 2em;
}

.skeleton.p {
  width: 100%;
}

.skeleton.p-last {
  width: 80%;
}

@keyframes skeleton-loading {
  0% {
    opacity: 0.6;
  }

  50% {
    opacity: 0.3;
  }

  100% {
    opacity: 0.6;
  }
}

/* Comment Selection Menu */
#selection-menu {
  position: absolute;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 4px 8px;
  display: flex;
  gap: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1002;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px) scale(0.95);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#selection-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* Mobile Selection Menu Override */
@media (max-width: 768px) {
  #selection-menu {
    position: fixed !important;
    bottom: 24px !important;
    top: auto !important;
    left: 50% !important;
    transform: translate(-50%, 30px) scale(0.9) !important;
    padding: 8px 20px;
    gap: 16px;
    border-radius: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  }
  #selection-menu.active {
    transform: translate(-50%, 0) scale(1) !important;
  }
  .selection-menu-btn {
    width: 44px;
    height: 44px;
  }
  .selection-menu-btn svg {
    width: 22px;
    height: 22px;
  }
}

.selection-menu-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-color);
  transition: background-color 0.2s;
}

.selection-menu-btn:hover {
  background-color: var(--sidebar-hover);
}

.selection-menu-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.selection-menu-btn.btn-praise {
  color: #10b981;
}

.selection-menu-btn.btn-suggest {
  color: #f59e0b;
}

.selection-menu-btn.btn-replace {
  color: #8b5cf6;
}

/* Comment Highlights */
.comment-highlight {
  cursor: pointer;
  position: relative;
  transition: background-color 0.2s;
}

.comment-highlight.status-praise {
  background-color: rgba(16, 185, 129, 0.15);
  border-bottom: 2px dotted #10b981;
}

.comment-highlight.status-suggest {
  background-color: rgba(245, 158, 11, 0.15);
  border-bottom: 2px dotted #f59e0b;
}

.comment-highlight.status-replace {
  background-color: rgba(139, 92, 246, 0.15);
  border-bottom: 2px dotted #8b5cf6;
}

.comment-highlight:hover {
  background-color: rgba(16, 185, 129, 0.25);
}

.comment-highlight.status-suggest:hover {
  background-color: rgba(245, 158, 11, 0.25);
}

.comment-highlight.status-replace:hover {
  background-color: rgba(139, 92, 246, 0.25);
}


/* Floating Comment Tooltip */
#comment-tooltip {
  position: absolute;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1003;
  max-width: 280px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
  font-size: 0.85rem;
  line-height: 1.5;
  font-family: var(--font-sans);
}

#comment-tooltip.active {
  opacity: 1;
  visibility: visible;
}

.tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
  font-weight: 600;
  font-size: 0.75rem;
}

.tooltip-header.praise {
  color: #10b981;
}

.tooltip-header.suggest {
  color: #f59e0b;
}

.tooltip-time {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Image Lightbox Modal */
#image-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

#image-modal.open {
  opacity: 1;
  visibility: visible;
}

.image-modal-container {
  position: relative;
  max-width: 92vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.image-modal-img {
  max-width: 92vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  cursor: zoom-in;
}

.image-modal-img.zoomed {
  transform: scale(1.6);
  cursor: zoom-out;
}

.image-modal-caption {
  color: #ffffff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  margin-top: 14px;
  text-align: center;
  opacity: 0.9;
  background: rgba(0, 0, 0, 0.4);
  padding: 6px 16px;
  border-radius: 20px;
}

.image-modal-controls {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 10px;
  z-index: 2010;
}

.image-modal-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ffffff;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  transition: background 0.2s ease, transform 0.2s ease;
}

.image-modal-btn:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.05);
}

.image-modal-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

/* Enhanced Markdown Figures & Images */
.reader-image-figure {
  margin: 24px 0;
  text-align: center;
}

.reader-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 12px auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: block;
}

.reader-content img:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.reader-image-caption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
  font-style: italic;
}

/* Internal Markdown Document Links & Image Badges */
.reader-content a.internal-doc-link {
  color: var(--accent-color);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: opacity 0.2s ease, text-decoration-color 0.2s ease;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.reader-content a.internal-doc-link:hover {
  opacity: 0.75;
  text-decoration-color: transparent;
}

.reader-content a.image-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 16px;
  color: var(--text-color);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  margin: 4px 0;
  transition: background-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.reader-content a.image-link-badge:hover {
  background-color: var(--sidebar-hover);
  transform: translateY(-1px);
}

/* Mermaid Diagrams Container & Styling */
.mermaid-container {
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin: 24px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.mermaid {
  font-family: var(--font-sans) !important;
  max-width: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
}

/* Built-in Standalone Relationship Graph Renderer */
.builtin-graph-wrapper {
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  margin: 16px 0;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  font-family: var(--font-sans);
  width: 100%;
}

.graph-groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.graph-group-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.graph-group-card:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.graph-group-header {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
  margin-bottom: 4px;
  opacity: 0.9;
}

.graph-group-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.graph-node-pill {
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s, transform 0.2s, border-color 0.2s;
  cursor: default;
}

.graph-node-pill:hover {
  background-color: var(--sidebar-hover);
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.node-title {
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--text-color);
}

.node-subtext {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Relationship Connections List */
.graph-connections-container {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.graph-connections-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.graph-connections-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 8px;
}

.graph-edge-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.graph-edge-card:hover {
  border-color: var(--accent-color);
  background-color: var(--sidebar-bg);
}

.graph-edge-card.thick {
  border-left: 3.5px solid var(--accent-color);
}

.graph-edge-card.dashed {
  border-style: dashed;
}

.edge-from,
.edge-to {
  font-weight: 600;
  color: var(--text-color);
}

.edge-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.edge-label-badge {
  margin-left: auto;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Tree Graph Layout Styling */
.tree-graph-wrapper {
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  margin: 20px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  font-family: var(--font-sans);
  width: 100%;
}

.tree-graph-header {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tree-subgraph-group {
  margin-bottom: 22px;
}

.tree-subgraph-group:last-child {
  margin-bottom: 0;
}

.tree-subgraph-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-color);
  margin-bottom: 10px;
  padding: 4px 10px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  display: inline-block;
  opacity: 0.95;
}

.tree-cards-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tree-character-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 16px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.tree-character-card:hover {
  border-color: var(--accent-color);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.tree-char-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.tree-char-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-color);
}

.tree-char-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.tree-branches {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 10px;
  border-left: 2px dashed var(--border-color);
  margin-left: 6px;
}

.tree-branch {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  line-height: 1.4;
}

.tree-branch-symbol {
  font-family: monospace;
  color: var(--text-muted);
  font-weight: bold;
}

.tree-branch-target {
  font-weight: 600;
  color: var(--text-color);
}

.tree-branch-arrow {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.tree-branch-badge {
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  padding: 2px 9px;
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tree-branch-badge.thick {
  font-weight: 600;
  color: var(--accent-color);
  border-color: var(--accent-color);
}

.tree-branch-badge.dashed {
  border-style: dashed;
}

/* Modern Responsive Markdown Table Theme */
.table-container {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
  background-color: var(--sidebar-bg);
  -webkit-overflow-scrolling: touch;
}

.reader-content table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  text-align: left;
  margin: 0;
}

.reader-content th {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

.reader-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
  line-height: 1.6;
  vertical-align: middle;
}

.reader-content tr:last-child td {
  border-bottom: none;
}

.reader-content tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.02);
}
[data-theme="dark"] .reader-content tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.025);
}

.reader-content tr:hover td {
  background-color: var(--sidebar-hover);
}

/* Threat Code / Tag Badges */
.threat-tag-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.74rem;
  padding: 3px 8px;
  border-radius: 6px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
}

.threat-tag-badge.threat-pax {
  background-color: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}
.threat-tag-badge.threat-hor {
  background-color: rgba(59, 130, 246, 0.12);
  color: #3b82f6;
  border-color: rgba(59, 130, 246, 0.3);
}
.threat-tag-badge.threat-per {
  background-color: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  border-color: rgba(245, 158, 11, 0.3);
}
.threat-tag-badge.threat-mor {
  background-color: rgba(168, 85, 247, 0.12);
  color: #a855f7;
  border-color: rgba(168, 85, 247, 0.3);
}
.threat-tag-badge.threat-rui {
  background-color: rgba(107, 114, 128, 0.12);
  color: #6b7280;
  border-color: rgba(107, 114, 128, 0.3);
}
.threat-tag-badge.threat-cat {
  background-color: rgba(239, 68, 68, 0.12);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.3);
}
.threat-tag-badge.threat-aby {
  background-color: rgba(225, 29, 72, 0.2);
  color: #e11d48;
  border-color: rgba(225, 29, 72, 0.5);
  box-shadow: 0 0 8px rgba(225, 29, 72, 0.2);
}

/* Right-Side Comment Sidebar */
#comment-sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  right: -300px;
  width: 300px;
  background-color: var(--sidebar-bg);
  border-left: 1px solid var(--border-color);
  z-index: 1010;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: flex;
  flex-direction: column;
}

#comment-sidebar.open {
  transform: translateX(-300px);
}

.comment-sidebar-header {
  height: 56px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 16px;
}

.comment-sidebar-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.9;
}

.comment-sidebar-actions {
  display: flex;
  gap: 4px;
}

/* Comment Tabs & Global View Badges */
.comment-sidebar-tabs {
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--sidebar-bg);
  overflow-x: auto;
  scroll-behavior: smooth;
  flex-shrink: 0;
}

.comment-tab-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 3px 10px;
  font-size: 0.74rem;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.comment-tab-btn:hover {
  border-color: var(--accent-color);
  color: var(--text-color);
}

.comment-tab-btn.active {
  background-color: var(--text-color) !important;
  color: var(--bg-color) !important;
  border-color: var(--text-color) !important;
}

.comment-tab-btn.active span {
  color: var(--bg-color) !important;
}

.comment-card-chapter-badge {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-color);
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2px 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.comment-card-chapter-badge:hover {
  border-color: var(--accent-color);
  background-color: var(--sidebar-hover);
}

/* Date Filter Styling */
.comment-date-filter-bar {
  padding: 8px 12px;
  background-color: var(--sidebar-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.date-filter-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.comment-date-select {
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 0.76rem;
  font-family: var(--font-sans);
  outline: none;
  cursor: pointer;
  flex-grow: 1;
}

.comment-date-select:focus {
  border-color: var(--accent-color);
}

.filtered-count-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.custom-date-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  margin-top: 2px;
}

.comment-date-input {
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 3px 6px;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  width: 100%;
  outline: none;
}

.comment-date-input:focus {
  border-color: var(--accent-color);
}

.comment-sidebar-content {
  overflow-y: auto;
  flex-grow: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Jump & Highlight Pulse Animation */
@keyframes jumpHighlightPulse {
  0% {
    background-color: #ef4444 !important;
    color: #ffffff !important;
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.9), 0 0 30px rgba(239, 68, 68, 0.5);
    border-radius: 4px;
  }
  50% {
    background-color: rgba(239, 68, 68, 0.65) !important;
    box-shadow: 0 0 24px rgba(239, 68, 68, 0.8);
  }
  100% {
    box-shadow: none;
  }
}

.comment-highlight.jump-active {
  animation: jumpHighlightPulse 2s ease-in-out forwards;
  transition: all 0.3s ease;
}

.comment-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  cursor: pointer;
}

.comment-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  border-color: var(--accent-color);
}

.comment-card-quote {
  font-size: 0.8rem;
  color: var(--text-muted);
  border-left: 2px solid var(--border-color);
  padding-left: 8px;
  margin: 0;
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}

.comment-card-quote:hover {
  color: var(--text-color);
}

.comment-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.comment-card-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
}

.comment-card-badge.praise {
  background-color: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.comment-card-badge.suggest {
  background-color: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.comment-card-text {
  line-height: 1.5;
  word-break: break-word;
  color: var(--text-color);
}

.comment-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4px;
}

.comment-card-time {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.comment-card-btns {
  display: flex;
  gap: 6px;
}

.comment-card-btn {
  background: none;
  border: none;
  padding: 2px;
  cursor: pointer;
  color: var(--text-muted);
  transition: color 0.2s;
}

.comment-card-btn:hover {
  color: var(--text-color);
}

.comment-card-btn.delete:hover {
  color: #ef4444;
}

.comment-card-btn svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.empty-comments {
  text-align: center;
  color: var(--text-muted);
  margin-top: 40px;
  font-size: 0.85rem;
}

/* Comment Modal Form */
#comment-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1020;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

#comment-modal.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 90%;
  max-width: 450px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transform: translateY(20px);
  transition: transform 0.3s;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#comment-modal.open .modal-content {
  transform: translateY(0);
}

.modal-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-title.praise {
  color: #10b981;
}

.modal-title.suggest {
  color: #f59e0b;
}

.modal-quote {
  font-size: 0.85rem;
  color: var(--text-muted);
  border-left: 2px solid var(--border-color);
  padding-left: 10px;
  margin: 0;
  font-style: italic;
  max-height: 80px;
  overflow-y: auto;
}

.modal-textarea {
  width: 100%;
  height: 100px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--sidebar-bg);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 10px;
  resize: none;
  outline: none;
  transition: border-color 0.2s;
}

.modal-textarea:focus {
  border-color: var(--accent-color);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.modal-btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s, opacity 0.2s;
}

.modal-btn.cancel {
  background-color: var(--sidebar-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.modal-btn.cancel:hover {
  background-color: var(--sidebar-hover);
}

.modal-btn.save {
  background-color: var(--accent-color);
  color: var(--bg-color);
}

.modal-btn.save:hover {
  opacity: 0.9;
}

@media (max-width: 480px) {
  .chapter-title-header {
    display: none;
  }

  .header-left {
    gap: 6px;
  }

  header {
    padding: 0 8px;
  }
}

/* Audio Player UI */
.audio-player-container {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--surface-bg, #ffffff);
  border: 1px solid var(--border-color, #e5e7eb);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  border-radius: 30px;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  z-index: 1000;
  width: 90%;
  max-width: 500px;
  transition: all 0.3s ease;
}

[data-theme="dark"] .audio-player-container {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.audio-controls {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 12px;
}

.audio-btn {
  background: none;
  border: none;
  color: var(--primary-color, #3b82f6);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  transition: background-color 0.2s, color 0.2s;
}

.audio-btn:hover {
  background-color: var(--bg-color, #f3f4f6);
}

.audio-btn svg {
  width: 20px;
  height: 20px;
}

.audio-progress-wrapper {
  flex-grow: 1;
  height: 6px;
  background-color: var(--border-color, #e5e7eb);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
}

.audio-progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background-color: var(--primary-color, #3b82f6);
  border-radius: 3px;
  width: 0%;
  pointer-events: none;
}

.audio-time-display {
  font-family: var(--font-sans, sans-serif);
  font-size: 0.75rem;
  color: var(--text-muted, #6b7280);
  min-width: 65px;
  text-align: center;
}

.close-audio {
  color: var(--text-muted, #6b7280);
}

/* Audio Highlighting inside Markdown */
.audio-highlight {
  background-color: rgba(59, 130, 246, 0.2);
  border-bottom: 2px solid var(--primary-color, #3b82f6);
  color: inherit;
  transition: background-color 0.1s ease;
}

[data-theme="dark"] .audio-highlight {
  background-color: rgba(59, 130, 246, 0.3);
}

/* ==========================================================================
   Base Modal Backdrop & Container Styles
   ========================================================================== */
.modal-backdrop,
#comment-modal {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  background-color: rgba(0, 0, 0, 0.65) !important;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 2500 !important;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  box-sizing: border-box;
}

.modal-content {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  max-width: 550px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 20px;
  box-sizing: border-box;
  animation: modalPop 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPop {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* ==========================================================================
   Search Modal & Engine Styles
   ========================================================================== */
.search-modal-content {
  max-width: 680px;
  width: 92%;
  max-height: 80vh;
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 12px;
  background-color: var(--bg-color);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
}

.search-input-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  gap: 10px;
  background-color: var(--sidebar-bg);
}

.search-input-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-color);
  outline: none;
}

.search-clear-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 4px;
}

.search-close-btn {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
}

.search-filters {
  display: flex;
  gap: 6px;
  padding: 8px 16px;
  overflow-x: auto;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-color);
}

.search-filter-chip {
  padding: 4px 10px;
  border-radius: 16px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.search-filter-chip:hover {
  background-color: var(--sidebar-bg);
  color: var(--text-color);
}

.search-filter-chip.active {
  background-color: var(--primary-color, #3b82f6);
  color: #ffffff;
  border-color: var(--primary-color, #3b82f6);
}

.search-results-container {
  flex: 1;
  overflow-y: auto;
  min-height: 240px;
  max-height: 55vh;
  padding: 10px 16px;
}

.search-empty-state {
  text-align: center;
  padding: 30px 10px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.search-suggest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-top: 14px;
}

.search-suggest-tag {
  padding: 4px 10px;
  border-radius: 12px;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-suggest-tag:hover {
  border-color: var(--primary-color, #3b82f6);
  color: var(--primary-color, #3b82f6);
}

.search-results-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.search-result-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.15s ease;
  border-bottom: 1px solid var(--border-color);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover,
.search-result-item.selected {
  background-color: var(--sidebar-bg);
}

.search-result-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.search-result-badge {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
  background-color: var(--border-color);
  color: var(--text-muted);
}

.search-result-badge.badge-chapters { background-color: #3b82f620; color: #3b82f6; }
.search-result-badge.badge-lore { background-color: #8b5cf620; color: #8b5cf6; }
.search-result-badge.badge-characters { background-color: #ec489920; color: #ec4899; }
.search-result-badge.badge-creature { background-color: #f9731620; color: #f97316; }
.search-result-badge.badge-dictionary { background-color: #10b98120; color: #10b981; }

.search-result-title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-color);
}

.search-result-snippet {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.search-highlight {
  background-color: rgba(234, 179, 8, 0.35);
  color: inherit;
  font-weight: 600;
  padding: 0 2px;
  border-radius: 2px;
}

.search-no-result {
  text-align: center;
  padding: 30px 10px;
  font-family: var(--font-sans);
}

.search-modal-footer {
  display: flex;
  gap: 16px;
  padding: 8px 16px;
  background-color: var(--sidebar-bg);
  border-top: 1px solid var(--border-color);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.search-modal-footer kbd {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 1px 4px;
}

/* ==========================================================================
   AI Helper Modal Styles
   ========================================================================== */
.ai-modal-content {
  max-width: 720px;
  width: 92%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  border-radius: 12px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.modal-close-x {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
}

.ai-tab-buttons {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  overflow-x: auto;
}

.ai-tab-btn {
  padding: 6px 12px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.ai-tab-btn:hover {
  color: var(--text-color);
}

.ai-tab-btn.active {
  background-color: var(--primary-color, #3b82f6);
  color: #ffffff;
  border-color: var(--primary-color, #3b82f6);
}

.ai-preview-box {
  flex: 1;
  min-height: 250px;
  max-height: 45vh;
  margin-bottom: 12px;
}

.ai-prompt-textarea {
  width: 100%;
  height: 100%;
  min-height: 240px;
  resize: vertical;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-color);
  font-family: monospace, var(--font-sans);
  font-size: 0.84rem;
  padding: 10px 12px;
  line-height: 1.5;
  outline: none;
}

.ai-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
}

.ai-links {
  display: flex;
  gap: 8px;
}

.ai-direct-link {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--primary-color, #3b82f6);
  text-decoration: none;
  padding: 3px 8px;
  border-radius: 4px;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
}

.ai-direct-link:hover {
  text-decoration: underline;
}

/* =============================================================
   Dynamic Folder Tree & Accordion Styles
   ============================================================= */

.sidebar-category.collapsible {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 8px;
}

.sidebar-category.collapsible:hover {
  background-color: var(--sidebar-hover);
}

.cat-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cat-chevron,
.folder-chevron {
  font-size: 0.65rem;
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: inline-block;
  opacity: 0.6;
}

.sidebar-category.collapsed .cat-chevron,
.chapter-folder-header.collapsed .folder-chevron {
  transform: rotate(-90deg);
}

.category-group {
  list-style: none;
  padding: 0;
  margin: 0;
}

.category-group.collapsed,
.chapter-folder-parts.collapsed,
.subfolder-group.collapsed {
  display: none !important;
}

.chapter-folder-header {
  padding: 7px 16px;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-color);
  opacity: 0.85;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, opacity 0.2s ease;
}

.chapter-folder-header:hover {
  background-color: var(--sidebar-hover);
  opacity: 1;
}

.chapter-folder-parts {
  list-style: none;
  padding: 0 0 4px 0;
  margin: 0;
}

.part-item {
  padding-left: 28px !important;
  font-size: 0.82rem;
}

.subfolder-header {
  padding: 6px 16px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  opacity: 0.7;
  color: var(--accent-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.subfolder-header:hover {
  background-color: var(--sidebar-hover);
}

.subfolder-group {
  list-style: none;
  padding-left: 8px;
  margin: 0;
}